If the radius of the circle is increased by $20\%$ then the corresponding increase in the area of the circle is _____. $\left(\mathrm{\pi }=3.14\right)$

Total surface area of the following closed figure is _____ ${\mathrm{units}}^2$.

What will be the cost of making design in the coloured region at the rate of $₹25$ per $c{m}^2$?

From each corner of a square of side $4 \mathrm{cm}$, a quadrant of a circle of radius $1 \mathrm{cm}$ is cut and also a circle of diameter $2 \mathrm{cm}$ as shown in the figure below. Find the area of the remaining portion of the square $($ Take $\mathrm{\pi }=\frac{22}{7}$)